Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b74671461ec98e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-15 01:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc5b2322cbc831817077045c08ce9a8 SHA-1: 87ca3205cfd85304c99c81f6e39228fd3b6bc13b SHA-256: 30b74671461ec98ef6f94167460c67cfaef21419bced8fd7791521441420bc38
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=how+to+mortgage+property+in+monopoly+app
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/3471385.pdf
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/108e91a74.pdf
    • http://tuzurew.iblogger.org/pleomorphic_adenoma_malignant_transformation_rate.pdf
    • http://br1.red/58838968263hh8n2.pdf
    • http://afracheat5.xyz/31103561894zpxcc.pdf
    • http://letuxegesilem.iblogger.org/free_balanced_scorecard_ppt_template.pdf
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/9882379.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_51e8f8dae814476a8576f3e0e35499ef.pdf?index=true
    • http://ruxozuxikoba.rf.gd/elements_of_statistical_learning_second_edition.pdf
    • http://mamotupot.rf.gd/55825550471.pdf
    • https://uploads.strikinglycdn.com/files/1b8acbbe-44f0-4dcb-a06e-9ed24ace48de/what_size_chain_for_husqvarna_460_rancher.pdf
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_0eb7e890fb324a8abfc44ffcee59248e.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_97964731dde24642954c8d11d383885e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44b563a2-485b-450e-828d-bcda0ea3d3a5/film_response_paper_sample.pdf
    • https://uploads.strikinglycdn.com/files/7eb5295b-beb7-4bf1-b710-e8b14749fcad/zixexobiwisufokikeze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d0.bin
634ca7010cf9696d16013f2ae50228eb533e704073d78fc76a6e19b2be4c39ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5116 bytes
font_01_sfnt_off00010238.bin
0717cbdb572fa264116408206aed2ca54aa6f144a8e0d0d66f0ee47770a8183f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11040 bytes

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